diff options
Diffstat (limited to 'recipes/linux/linux-omap-psp-2.6.32/0036-ARM-Expose-some-CPU-control-registers-via-sysfs.patch')
| -rw-r--r-- | recipes/linux/linux-omap-psp-2.6.32/0036-ARM-Expose-some-CPU-control-registers-via-sysfs.patch | 202 |
1 files changed, 0 insertions, 202 deletions
diff --git a/recipes/linux/linux-omap-psp-2.6.32/0036-ARM-Expose-some-CPU-control-registers-via-sysfs.patch b/recipes/linux/linux-omap-psp-2.6.32/0036-ARM-Expose-some-CPU-control-registers-via-sysfs.patch deleted file mode 100644 index c7fa562ebe..0000000000 --- a/recipes/linux/linux-omap-psp-2.6.32/0036-ARM-Expose-some-CPU-control-registers-via-sysfs.patch +++ /dev/null @@ -1,202 +0,0 @@ -From eb05553047988e84a6be8d1548efbcb43ccbb13b Mon Sep 17 00:00:00 2001 -From: Mans Rullgard <mans@mansr.com> -Date: Tue, 10 Nov 2009 00:39:21 +0000 -Subject: [PATCH 36/45] ARM: Expose some CPU control registers via sysfs - -This creates sysfs files under /sys/devices/system/cpu/cpuN -exposing the values of the control register, auxiliary control -register, and L2 cache auxiliary control register. Writing to -the files allows setting the value of bits which are safe to -change at any time. - -Signed-off-by: Mans Rullgard <mans@mansr.com> ---- - arch/arm/Kconfig | 5 ++ - arch/arm/kernel/Makefile | 1 + - arch/arm/kernel/sysfs_v7.c | 146 ++++++++++++++++++++++++++++++++++++++++++++ - 3 files changed, 152 insertions(+), 0 deletions(-) - create mode 100644 arch/arm/kernel/sysfs_v7.c - -diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig -index f5ded3c..2d370da 100644 ---- a/arch/arm/Kconfig -+++ b/arch/arm/Kconfig -@@ -1252,6 +1252,11 @@ config UACCESS_WITH_MEMCPY - However, if the CPU data cache is using a write-allocate mode, - this option is unlikely to provide any performance gain. - -+config CPU_V7_SYSFS -+ bool -+ depends on CPU_V7 && SYSFS -+ default y -+ - endmenu - - menu "Boot options" -diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile -index dd00f74..ee20134 100644 ---- a/arch/arm/kernel/Makefile -+++ b/arch/arm/kernel/Makefile -@@ -38,6 +38,7 @@ obj-$(CONFIG_ARM_THUMBEE) += thumbee.o - obj-$(CONFIG_KGDB) += kgdb.o - obj-$(CONFIG_ARM_UNWIND) += unwind.o - obj-$(CONFIG_HAVE_TCM) += tcm.o -+obj-$(CONFIG_CPU_V7_SYSFS) += sysfs_v7.o - - obj-$(CONFIG_CRUNCH) += crunch.o crunch-bits.o - AFLAGS_crunch-bits.o := -Wa,-mcpu=ep9312 -diff --git a/arch/arm/kernel/sysfs_v7.c b/arch/arm/kernel/sysfs_v7.c -new file mode 100644 -index 0000000..c05bf5f ---- /dev/null -+++ b/arch/arm/kernel/sysfs_v7.c -@@ -0,0 +1,146 @@ -+/* -+ * linux/arch/arm/kernel/sysfs.c -+ * -+ * Copyright (C) 2008 Mans Rullgard -+ * -+ * This program is free software; you can redistribute it and/or modify -+ * it under the terms of the GNU General Public License version 2 as -+ * published by the Free Software Foundation. -+ */ -+ -+#include <linux/kernel.h> -+#include <linux/cpu.h> -+#include <linux/sysdev.h> -+#include <linux/fs.h> -+ -+#define SETBITS(val, bits, new) \ -+ do { \ -+ val &= ~bits; \ -+ val |= new & bits; \ -+ } while (0) -+ -+#define SHOW_REG(name, opc1, crn, crm, opc2) \ -+static ssize_t name##_show(struct sys_device *dev, \ -+ struct sysdev_attribute *attr, \ -+ char *buf) \ -+{ \ -+ unsigned val; \ -+ asm ("mrc p15,"#opc1", %0,"#crn","#crm","#opc2 : "=r"(val)); \ -+ return snprintf(buf, PAGE_SIZE, "%08x\n", val); \ -+} -+ -+#define STORE_REG(name, opc1, crn, crm, opc2, bits) \ -+static ssize_t name##_store(struct sys_device *dev, \ -+ struct sysdev_attribute *attr, \ -+ const char *buf, size_t size) \ -+{ \ -+ char *end; \ -+ unsigned new = simple_strtoul(buf, &end, 0); \ -+ unsigned val; \ -+ \ -+ if (end == buf) \ -+ return -EINVAL; \ -+ \ -+ asm ("mrc p15,"#opc1", %0,"#crn","#crm","#opc2 : "=r"(val)); \ -+ SETBITS(val, bits, new); \ -+ asm ("mcr p15,"#opc1", %0,"#crn","#crm","#opc2 :: "r"(val)); \ -+ \ -+ return end - buf; \ -+} -+ -+#define RD_REG(name, opc1, crn, crm, opc2) \ -+ SHOW_REG(name, opc1, crn, crm, opc2) \ -+ static SYSDEV_ATTR(name, S_IRUGO|S_IWUSR, name##_show, NULL) -+ -+#define RDWR_REG(name, opc1, crn, crm, opc2, bits) \ -+ SHOW_REG(name, opc1, crn, crm, opc2) \ -+ STORE_REG(name, opc1, crn, crm, opc2, bits) \ -+ static SYSDEV_ATTR(name, S_IRUGO|S_IWUSR, name##_show, name##_store) -+ -+RDWR_REG(control, 0, c1, c0, 0, 0x802); -+ -+SHOW_REG(aux_ctl, 0, c1, c0, 1) -+ -+#ifdef CONFIG_ARCH_OMAP34XX -+static ssize_t aux_ctl_store(struct sys_device *dev, -+ struct sysdev_attribute *attr, -+ const char *buf, size_t size) -+{ -+ char *end; -+ unsigned new = simple_strtoul(buf, &end, 0); -+ unsigned val; -+ -+ if (end == buf) -+ return -EINVAL; -+ -+ asm ("mrc p15, 0, %0, c1, c0, 1" : "=r"(val)); -+ SETBITS(val, 0xff8, new); -+ val &= ~2; -+ asm ("mov r0, %0 \n\t" -+ "mov r12, #3 \n\t" -+ "smc #0 \n\t" -+ :: "r"(val) : "r0", "r12"); -+ -+ return end - buf; -+} -+#define AUX_WR S_IWUSR -+#else -+#define aux_ctl_store NULL -+#define AUX_WR 0 -+#endif -+ -+static SYSDEV_ATTR(aux_control, S_IRUGO|AUX_WR, aux_ctl_show, aux_ctl_store); -+ -+SHOW_REG(l2_aux_ctl, 1, c9, c0, 2) -+ -+#ifdef CONFIG_ARCH_OMAP34XX -+static ssize_t l2_aux_ctl_store(struct sys_device *dev, -+ struct sysdev_attribute *attr, -+ const char *buf, size_t size) -+{ -+ char *end; -+ unsigned new = simple_strtoul(buf, &end, 0); -+ unsigned val; -+ -+ if (end == buf) -+ return -EINVAL; -+ -+ asm ("mrc p15, 1, %0, c9, c0, 2" : "=r"(val)); -+ SETBITS(val, 0xbc00000, new); -+ asm ("mov r0, %0 \n\t" -+ "mov r12, #2 \n\t" -+ "smc #0 \n\t" -+ :: "r"(val) : "r0", "r12"); -+ -+ return end - buf; -+} -+#define L2AUX_WR S_IWUSR -+#else -+#define l2_aux_ctl_store NULL -+#define L2AUX_WR 0 -+#endif -+ -+static SYSDEV_ATTR(l2_aux_control, S_IRUGO|L2AUX_WR, -+ l2_aux_ctl_show, l2_aux_ctl_store); -+ -+#define REG_ATTR(sysdev, name) \ -+ do { \ -+ int err = sysfs_create_file(&sysdev->kobj, &name.attr); \ -+ WARN_ON(err != 0); \ -+ } while (0) -+ -+static int __init cpu_sysfs_init(void) -+{ -+ struct sys_device *sysdev; -+ int cpu; -+ -+ for_each_possible_cpu(cpu) { -+ sysdev = get_cpu_sysdev(cpu); -+ REG_ATTR(sysdev, attr_control); -+ REG_ATTR(sysdev, attr_aux_control); -+ REG_ATTR(sysdev, attr_l2_aux_control); -+ } -+ -+ return 0; -+} -+device_initcall(cpu_sysfs_init); --- -1.6.6.1 - |